Study of Granitoid Distribution at Toboali Waters, Bangka Belitung Province: Seismic data interpretation approach

Muhammad Zulfikar, Noor Cahyo Dwi Aryanto, Andi Agus Nur, Ildrem Syafri


Abstract


Bangka Island is one of the islands in Indonesia which is traversed by Southeast Asia granitoid belt. This belt stretches from Burma (Myanmar) to Bangka Belitung. This granitoid has potential as a source rock of mineral that carrying tin and rare earth element. At present, mapping of granitoid rocks to the waters area is rarely published, so acoustic basement mapping is necessary to do in order to determine the distribution of granitoids in Toboali waters. The research method used is a single channel seismic with an energy source of 300 joules. The sound source uses a single plate boomer, so it has a high enough resolution but the penetration is not deep enough. Acoustic basement in Toboali waters varies in depth from 15 - 75 ms or getting deeper south. When viewed from the continuity of the acoustic basement, it is estimated that the granitoid is 7 km from the nearest coastline.

Key words: single channel seismic, seismic interprtation, granitoid distribution, Toboali Waters, Bangka Belitung Province

Pulau Bangka merupakan salah satu pulau di Indonesia yang dilalui oleh jalur granitoid Asia Tenggara. Jalur ini membentang dari Burma (Myanmar) hingga Bangka Belitung. Granitoid ini memiliki potensi sebagai batuan sumber pembawa mineral timah dan unsur tanah jarang. Pada saat ini pemetaan batuan granitoid pada daerah perairan jarang dipublikasikan, sehingga pemetaan batuan dasar akustik perlu dilakukan dalam rangka mengetahui sebaran granitoid di Perairan Toboali. Metode penelitian yang digunakan yaitu seismik single channel dengan sumber energi yang dikeluarkan sebesar 300 joule. Sumber suaranya menggunakan boomer single plate, sehingga memiliki resolusi yang cukup tinggi akan tetapi penetrasinya tidak cukup dalam. Batuan dasar akustik di Perairan Toboali memiliki kedalaman bervariasi mulai dari 15 – 75 ms atau semakin ke selatan semakin dalam. Jika dilihat dari kemenerusan batuan dasar akustiknya diperkirakan granitoid tersebut berada 7 km dari garis pantai terdekat.

Kata kunci: Seismik single channel, interpretasi seismik, distribusi granitoid, Perairan Toboali, Provinsi Bangka Belitung


Keywords


Seismic interpretation; granitoid; Toboali waters

Full Text:

PDF

References


Aryanto, N.C.D., 2014. Composition and Mineral Potential and Rare Earth Elements (REE) in Granite Belt in Indo-Western Region. Proceedings PIT IAGI, Jakarta.

Aryanto, N.C.D., Kamiludin, U. Mustafa, M.A., Setyanto, A., and Surachman, M., 2015. Survei Pendahuluan Kandungan Mineral Plaser dan REE di Pantai dan Perairan Toboali, Bangka Belitung. Internal report, Marine Geological Institute, Bandung.

Cobbing, E.J. 2005. Granites. Sumatra: Geology, Resources, and Tectonic Evolution, Geological Society of London Memoirs.

Mangga, S.A., and Djamal, B. 1994. Geology of North Bangka Island. Geological Research and Development Centre, Bandung.

Margono, U., Supandjono, RJB., and Partoyo, E. 1995. Geology of South Bangka Island. Geological Research and Development Centre, Bandung.

Simamora, W.H. 2007. Penafsiran struktur bawah permukaan daerah bangka utara, berdasarkan anomali gaya berat, JSDG, XVII(3), pp. 163-177.

Usman, E. 2007. Penyebaran Batuan Granit dan Sedimen Kuarter Berdasarkan Interpretasi Data Seismik di Perairan Batam Utara, JSDG, XVII(1), pp. 3-12.

Veeken, P.C. H. 2007. Seismic Stratigraphy, Basin Analysis and Reservoir Characterisation. Amsterdam: Elsevier.

Widana, K.S. 2013. Petrography and Geochemistry of Major Element Bangka Island Granitoid: Preliminary Study Tectonics magmatism, Eksplorium, 34, 75-88.

Winter, J. D. 2001. An introduction to igneous and metamorphic petrology, 343-361

Zulfikar, M., and Aryanto, N.C.D. 2016. The Study of Seafloor Tin Placer Resources of Quaternary Sediment at Toboali Waters, South Bangka, Bulletin of the Marine Geology, 31(2), pp. 67-76. Doi: 10.32693/bomg.31.2.2016.285..




DOI: http://dx.doi.org/10.32693/bomg.35.2.2020.681


Accredited by Ministry of Research, Technology, and Higher Education, Republic Indonesia 


Abstracted/Indexed by: